Sector 32 is already in use by the program `FlexNet'
Never heard of that FlexNet thing, but according to Wikipedia it’s a software license manager. And we all know how this whole DRM thing just bugs us.. So it bugged me because the new system wouldn’t boot properly.. Other people having similar problems.
However, it seems impossible to force grub overriding this sector, but you may wipe it manually. In my case sector 32 was infected by DRM, so I did the following:
If that’s done Grub installs like a charm, the system booted again, and the admin was happy that another DRM thing died :)